Frequency counter with a PIC
This document describes the construction of small frequency counter with a cheap PIC microcontroller and a few seven-segment LED digits. The main features of the frequency counter are: frequency range 1 Hz … 50 MHz (prototype worked up to 60 MHz but this exceeds the PIC’s timing specifications) ,four or five digits resolution (display for example x.xxx kHz, x.xxx MHz, or xx.xx MHz) ,automatic range switching with different gate times ,optional addition or subtraction of a frequency offset (programmable) ,optional preamplifier for the input signal ,can be built on a single-sided ‘breadboard-style’ circuit board ,firmware available for common-cathode as well as commom-anode displays ,
very low component count: a PIC 16F628
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